This gym has been reported as closed.Altrain Fitness (formerly IronCross Fitness)Obstacle list, course information, upcoming competitions, class schedule, pricing, training info and more for the local American Ninja Warrior Gym Altrain Fitness (formerly IronCross Fitness). + Google Map 1831 Main Street Billings, MT 59105 United States (406)-591-0621 Gym Website & Social Channels Ninja Gym Description, Obstacle List, Class Schedule, and more Personal Training, Obstacle Race Training, & Ninja Warrior Training. Experience the most diverse training facility in the Northwest. Upcoming Ninja Warrior Competitions at Altrain Fitness (formerly IronCross Fitness)No upcoming competitions found Past Ninja Warrior Competitions at Altrain Fitness (formerly IronCross Fitness)No past competitions foundEmailTweetSharePin0 Shares